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Single Synchronous Buck DC/DC Converter IC with Built-in MOSFET for Automotive Applications

BD9S402MUF-C Buck DC/DC Converter IC
BD9S402MUF-C Buck DC/DC Converter IC

ROHM Semiconductor has developed the new buck DC/DC converter IC that comes with a built-in MOSFET (Switching regulator) and is designed for automotive applications such as infotainment and ADAS (Advanced Driver Assistance Systems) incorporating onboard sensors and cameras that are becoming more advanced. This new BD9S402MUF-C IC is equipped with a load response performance selection function that leverages the characteristics of QuiCur technology, allowing users to easily switch priority between ‘voltage fluctuation’ and ‘capacitance reduction’ by setting High/Low of the GAIN pin.


The BD9S402MUF-C IC supports output voltages down to 0.6V and 4A output current at switching frequencies higher than 2MHz in a compact size demanded by increasingly sophisticated secondary power supply applications for high-performance MCUs and SoCs. It enables stable operation at an industry-leading 30mV. This translates to a 25% reduction in output voltage fluctuation over class-leading standard products with equivalent functionality, making it ideal for use in the latest ADAS with severe power supply conditions requiring stable operation within 5% even with low voltage output.



  • QuiCurTM

  • Nano Pulse ControlTM

  • AEC-Q100 Qualified(Note 1)

  • Functional Safety Supportive Automotive Products

  • Single Synchronous Buck DC/DC Converter

  • Adjustable Soft Start Function

  • Output Discharge Function

  • Power Good Output

  • Under Voltage Lockout Protection (UVLO)

  • Short Circuit Protection (SCP)

  • Output Over Voltage Protection (OVP)

  • Over Current Protection (OCP)

  • Thermal Shutdown Protection (TSD)

  • Wettable Flank QFN Package



  • Automotive Equipment

  • Other Electronic Equipment


Availability & Pricing

The samples of BD9S402MUF-C IC are now available and mass production will begin in April 2023 with pricing at $1.57/unit (samples, excluding tax).

Component Datasheet

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